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Discussion Starter #1
Hello guys,

Just checking in and like to ask if anyone had done their valve adjustment on the 2G Ridgeline.

Any suggestions?
Also does anyone have the specs for valve clearance, cylinder numbers and firing order.

Reason I’m asking is because I’m getting misfire code on 2,4,5 cylinders and random misfire codes at 75,000 miles on 2017 Ridgeline.


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More likely bad coil packs or possibly fuel injectors than a valve adjustment.
Do you have the actual codes to share? That should help narrow down the field of suspects.
 

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Discussion Starter #3
Hello,

Thanks for replying.

Codes were p0302 p0304 p0305
And I think p0300 for random misfire.

Pulled spark plugs and don’t look good at all.
I will replace spark plugs and swap coils with the ones not giving fault codes.

These are 4-5-6 cylinders.
Any suggestions?




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I'm not sure I'm seeing this correctly, but the spark plug gap on bottom of the three plugs looks huge...that alone could be an issue for that cylinder. The others look okay, but hard to really see.
And they all look like they need to be replaced anyway.
302, 304, 305 are all just misfire codes for cylinders 2,4,5.
If my car, I'd replace all the spark plugs and all the coils at that point. It is very likely one or both of those issues and an easy to do self repair.
If money is a concern, I'd replace all the plugs first and see what happens. And then replace individual (2,4,5) cylinder's coil packs if needed.

And I know I've read a couple of posts about bad fuel injectors on 2017 models...which could also be the cause of misfires and plugs that look like yours. I'm not up on how to test those, but I'm sure someone on this forum does however.

This might help with the basics - which also starts with replacing the spark plugs:
 

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Discussion Starter #5
All are at about .044 I believe that is the required spec.



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Discussion Starter #8
I one of those 3 spark plugs is number 6 which didn’t give a fault. So I’m assuming they will all be in the same condition.


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I think your plan of attack makes sense...replace the plugs, switch out the coil packs and see if the problem moves to the switched cylinders...or just goes away.
Best of luck with it!
 

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2008 Ridgeline RTS in Billet Silver Metallic
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Am I missing something? Those plugs don't appear bad to me at all. They look normal imo.
 

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2017 RTL-E Rear-door mod, LED fog-lamps, bed cover, LED back up lights, LED full interior bulbs.
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Is there any better spark plug to use on a 2017 Ridgeline, besides the stock ones? And, any advantages on power/'fuel economy? I'm at 24k miles at this time...
 

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I don’t like the burnt in the back of the spark plug. They look like they are older than 75k.
I haven't needed to change the ones on my Ridgeline yet, but those are much more "burned" (darker and more extensive) than the 100,000 mile / 9 year ones I removed from my Pilot a few months ago (NGKs like yours).
 

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Misfires can be for many reasons. Hopefully, it's the fuel injectors (pattern issue on this engine) and not something like valves or rings. My brother in law just had a misfire on his 2012 Odyssey and it needed new rings but was covered under a warranty extension. Are the problem cylinders the VCM related ones on the cylinder bank closest to the firewall?
 

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Discussion Starter #18
Misfires can be for many reasons. Hopefully, it's the fuel injectors (pattern issue on this engine) and not something like valves or rings. My brother in law just had a misfire on his 2012 Odyssey and it needed new rings but was covered under a warranty extension. Are the problem cylinders the VCM related ones on the cylinder bank closest to the firewall?
These are front by radiator.


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I don’t like the burnt in the back of the spark plug. They look like they are older than 75k.


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Yeah, I noticed the burnt area on the north side of the plug. But the insulator and electrode looks perfect imo. Looks just the right color to me.
 

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Is there any better spark plug to use on a 2017 Ridgeline, besides the stock ones? And, any advantages on power/'fuel economy? I'm at 24k miles at this time...
Not to my knowledge. Stay with the OEM plug. Hard to beat 100+ k miles on the stock plug. And beware buying from Amazon. Lots of fake plugs there. I believe I was a victim of that scam and will no longer buy spark plugs there.
 
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